Dynamical spin-flip susceptibility for a strongly interacting ultracold Fermi gas

Details Dynamical spin-flip susceptibility for a strongly interacting ultracold Fermi gas Dynamical spin-flip susceptibility for a strongly interacting ultracold Fermi gas

2011-05-30

arxiv.org/abs/1105.5997v1

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

The Stoner model predicts that a two-component Fermi gas at increasing repulsive interactions undergoes a ferromagnetic transition. Using the random-phase approximation we study the dynamical properties of the interacting Fermi gas. For an atomic Fermi gas under harmonic confinement we show that the transverse (spin-flip) dynamical susceptibility displays a clear signature of the ferromagnetic phase in a magnon peak emerging from the Stoner particle-hole continuum. The dynamical spin susceptibilities could be experimentally explored via spin-dependent Bragg spectroscopy.

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